Question

Of the following thermometers, the one which can be used for measuring rapidly changing temperature is a

• A. Thermocouple thermometer
• B. Gas thermometer
• C. Platinum resistance thermometer
• D. Vapour pressure thermometer

Answer 1

Answer: (A)

Thermocouple thermometer

Answer 2

Principle of thermometer: The temperature of a substance can be measured by measuring (1) increase in volume of a gas on heating at constant pressure (2) increase in pressure of a gas on heating at constant volume (3) increase in resistance of a conductor on heating. Gas thermometer, platinum resistance, thermometer, vapour pressure thermometers are not ideal for measuring changing temperatures. Thermocouple Thermometer: A thermocouple thermometer is formed by joining two dissimilar metals and kept at different temperatures and is ideal for measuring rapidly changing temperatures.